If he doesn't fit definitely sell him. If he brings you that close to your goal defense, you could sell him, grind some solo challenges and then live the dream, but that's just my opinion. Just have fun with the game, and make your decision after some other people stop by this post and put in their opinions.

You should be fine. I was kind of concerned about my gourami going to the top of the tank when I first started taking care of aquariums. I looked into it and found out that they have an organ called the labyrinth organ that allows them to breathe air, so its most likely that your fish is just breathing like normal. It's actually really interesting because gouramis and betta fish are the only types of aquarium fish that I've heard of that can do this.

Its definately a bad idea, I will assume that you are kind of new to this hobby and don't know a lot about it, but you shouldn't have that many fish in a 3 gallon tank. 3 gallon tanks are about bare minimum size for betta fish and decent for shrimp. If I were you I wouldn't add anything else to your tank because it probably already has more fish in it than there should be.

I'm new to this tcg and just played it with a friend, I'm trying to get my little brother into it, so I hope I get one of the ex's, I can't really collect yet, so the shadowless set and dragon collection would be kind of useless to me, If I do win one of them I might give it away to whoever messages me first.

I'm a bit of a rookie, but I have heard that you want odd amounts of female bettas so they don't fight each other, so I would go with either 3 or 5 female bettas, I think getting some ottos to help clean the tank would be nice too, I have 1 in my 29 gallon